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ID = 28229
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  Reflex Klystron 
Identical to RK5981 = 5981

Filament Vf 6.3 Volts / If 0.455 Ampere / Indirect
Description 1245 to 1400 MHz, integral cavity, coaxial out probe through the octal-like base. 250V, 134mW output typical at 1390 MHz. 5981/RK5981 replaces both 5649 and 5650. 
Dimensions (WHD)
incl. pins / tip
41 x 128 x mm / 1.61 x 5.04 x inch
Information source -- Original-techn. papers.   
- - Manufacturers Literature   
Tube Lore (I)

RK5981: Raytheon Manual
Heinz Höger

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